2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21
The history of the invention of the thermos begins in the 19th century and is associated with the name of the English inventor James Dewar Dewar. But his goal was not to invent a container for keeping hot liquids warm. Its purpose was a device for storing rarefied gases. Some time later, his student and follower R. Burger found a niche for the commercial use of this invention. Soon, his company gained great popularity and was engaged in nothing more than the production and sale of thermoses.
Modern thermoses for tea, which we meet everywhere, are no different from the initial invention. And, as before, they are a glass or metal flask placed in a housing. Despite the fact that this invention is very simple in its essence, it has been used in people's lives for quite a long period of time.
Choosing a thermos
If a thermos for tea is to be actively used on various trips, hikes or travels, then for these purposes it is better to choose with a metal flask. It is much stronger and will easily withstand active use for a long period. If you plan to use a thermos for tea at home, then a glass flask will do. Despite the fact that it is more fragile and vulnerable to mechanical stress, it is nevertheless more practical from a hygienic point of view. At the same time, both the metal flask and the glass flask cope equally well with their main function.
It is believed that thermoses for tea in a plastic case keep the temperature better. This may be due to the lower thermal conductivity of plastic than metal. A good thermos for tea is able to keep the temperature at 50 degrees even after a day.
Leak test
The choice of a thermos should be approached very carefully and responsibly. After all, this thing is purchased for long-term use, and not for one day. First of all, it is worth checking how well and tightly the lid is screwed. This is the main criterion that affects the preservation of the temperature of the liquid.
Volume of flask
Also, the duration of maintaining the temperature depends on the volume of the flask. The larger the flask, the longer the temperature stays.
Foreign odors
When choosing a thermos, it must be opened. It should not exude any unpleasant odors. If the aroma is present, then this indicates the low quality of the materials used for production. The use of a thermos made of low-quality components can be harmful to he alth.
When choosing a glass thermos, shake it. The flask must be tightly fixed, otherwisesooner or later it will break. In this regard, a metal bulb is much stronger, but when deformed, microcracks can form in it, which will adversely affect the thermal insulation abilities due to leakage.
Gourmets and connoisseurs recommend using thermoses with a glass flask for brewing and infusion. They know exactly how to make tea in a thermos. This allows you to preserve the delicate taste of the drink, which is especially valued by lovers and regulars of tea ceremonies.
Testing in practice
The quality of the thermos can also be checked practically. If available at the place of purchase, this is the best way to evaluate this product. To do this, fill it with boiled water and leave for 15 minutes. If during this time the body heats up, then the thermos for tea is of poor quality. The liquid in it will cool down very quickly, and there is no point in such an acquisition.
In today's market there is a huge selection of thermoses that can satisfy the needs of any person in terms of design and practicality. Also, thermoses for food are widely used. They look like saucepans and keep the temperature in the same way.
So, the best thermoses for tea should meet the following requirements:
1. Should not exude sharp, unpleasant odors.
2. The lid should seal the flask tightly.
3. The larger the volume of the flask, the better the temperature is maintained.
4. A metal flask is more practical and durable to use, while a glass flask is more hygienic.
5. When filling with boiling water, the body of the thermos should not heat up.
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